My overall goal is to capture a 5.1 Surround sound audio feed to stream over the web. Hopefully via OPUS.

Currently, I have tested this with the Stereo Injector, and everything works just fine. However, it can't capture multiple (2>) channels.
I have also tested this with the Octave, and I run into a problem where the stereo encoders are not in sync, and I have to create 3 separate stereo files which I have to sync post production.

It would be nice to simply plug in my 6 feeds and select an algorithm to record, and then stream.

My overall goal is to capture a 5.1 Surround sound audio feed to stream over the web. Hopefully via OPUS.

Currently, I have tested this with the Stereo Injector, and everything works just fine. However, it can't capture multiple (2>) channels.
I have also tested this with the Octave, and I run into a problem where the stereo encoders are not in sync, and I have to create 3 separate stereo files which I have to sync post production.

It would be nice to simply plug in my 6 feeds and select an algorithm to record, and then stream.

A small format, inexpensive, multichannel card
I'm not sure what your retail price on the Zero will be, but based on the Kickstarter rewards I'm guessing it will be a fair bit less than the Octo. I'll probably pre-order a Zero as soon as they're available and make do with two channels, but ideally I'd like an extra two inputs if it could be done without vastly increasing the price. 8 out, 6 in would be fine, for the right price!